Deep dive into Wikipedia.

The #LouvrePyramid was built to update the #museum. Part of the reason for the update was to add a big area with many entries and exits, to and from different parts of the museum. This area is underground.

#Mitterrand initiated the project and succeeded, in part because he actually had the power to do it, even against resistance.

A #mockup of the #pyramid was built before the project really began.

Louvre Pyramid
https://en.wikipedia.org/wiki/Louvre_Pyramid?wprov=sfla1